starli of philadelphia



ELI T. srAEI-t, or PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 78,151, dated May 19, 1868.

IMPROVEMENT IN ARTIGULATORS.

tite Stipendi hiaat In im tipa datiert nturt maV matin/gent nf its ann.

TOALIIWHOM IT MAY CONGERN:

Be it known that I, ELI T. STARR, oi` the city and county oi` Philadelphimin the State of Pennsylvania, have invented a new and useful Improvement on Articulators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing forming part of this specification, and in which- Figure l represents a side `View of an articulator constructed according to my improvement.

Figure 2 a plan of the same, and

Figure 3 a front. view thereof.

Similar letters of reference indicate corresponding parts.

In deutistrry,rit has loing been a desideratum to construct an articulator which should possess all the necessary movements for obtaining acorr'ect articulation of artieial dentures. This my inventionl claims to effect, and combines simplicity oi adjustment or attachment of the upper andlower plates, either for repairor otherwise, the lower plate moving on cone-shaped pivots in V-shaped grooves, free of regular hinges, the same being retained in position by springs, arranged to admit of a ready detachment and self-tightening or close working of '.thejoint; also the'upper plate being bent or crooked, so that on reversing it the distance between the two plates may be changed, to allow for both upper and lower dentures.

u Referring-to the accompanying drawing, A represents the lower plate, which is modelled from the natural jaw. This lower plate is constructed to move on or with cone-shaped pivots, in V-shaped grooves, b, formed `in the upper plate B or bracket s, carrying the sam`e,'and is retained in position by elastic rubber bands or rings, c, or, if desired, spiral springs may be substituted therefor.

The upper plate, B, is, as in other articulators, connected with the bracket or vibrating portions thereof, by slot, and set-screw, to admit oi' its required backward or forward movement and retention at any desired point. C isthe usual set-screw for effecting the up and down adjustment of the plate B.

To allow for both upper and lower dentures, I crook the upper plate, as at d, so that, on reversing it from the position shown in the drawing, an increase of one inch, more or less, in space, is obtained between the plates A and B, i

By this, my'improvement, a backward, forward, and lateral motion is provided for, corresponding with the movements'oi` the naturaljaw, by which the arrangement oi` the denture can be practically tested without disturbingvthe articulation. p

What is here claimed, and desired to be secured by Letters Patent, is-.

`Il. The attachment of the lower plate A tothe upper plate B, or its bracket, by conc-shaped pivots a, arranged to t V-shaped grooves t, and retained in position by springs, substantially as specified.

2. Constructing the reversible upper plate B with a crook, as at ol, essentially as and for the purpose herein set forth.

ELI '.l. STARR.

Witnesses:V

WM. H. CocunANn. J. W, WHITE. 

